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From Joshua Slive <jsl...@gmail.com>
Subject Re: [users@httpd] RewriteMap prg vs cgi performance
Date Thu, 25 Aug 2005 23:47:40 GMT
On 8/25/05, allan juul <allan@muly.dk> wrote:
> hello,
> 
> i'm in doubt whether to use a perl cgi script or a perl program via
> mod_rewrite because of performance.
> 
> the actual processing is handling a client certificate and some xml and
> returning a base64-encoded string. processing takes less than a second
> but let's say it takes exactly one second
> 
> if the site gets 10 simultaneously requests for a cgi it will start 10
> perl interpreters (i guess) and all requests should be handled within a
> second.
> 
> but what happens if the site gets 10 simultaneously requests for a URI
> that is handled by a perl program via mod_rewrite? like:
> 
>   RewriteMap prg:perl_program.pl
> 
> i know theres only one perl interpreter started at server startup and it
> listens on STDIN - but does that mean it will handle the 10 request one
> by one? i mean, in this example it would appear to take 10 seconds for
> the last request?

Yes.  The requests are serialized (see the RewriteLock directive).

CGI is the safer alternative because it runs as the less-priveleged
user and a problem in one request won't hurt another request.  It may
or may not be faster than the RewriteMap depending on exactly what
resources are acting as constraints.

Joshua.

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